var SPRSet = _XrmServiceContext.KnowledgeArticleSet
            .Where(c => c.IsInternal == false)
            .Where(c => c.StateCode == Xrm.KnowledgeArticleState.Published)
            .OrderBy(s => s.LanguageLocaleId.Name)

SPRSet.OrderBy(s => _XrmOrganizationService.Retrieve(s.LanguageLocaleId.LogicalName, s.LanguageLocaleId.Id, new ColumnSet("name")).ToEntity<Xrm.LanguageLocale>().Name);

SPRSet.OrderBy(s => _XrmOrganizationService.Retrieve(s.LanguageLocaleId.LogicalName, s.LanguageLocaleId.Id, new ColumnSet("name")).GetAttributeValue<string>("name"));

var languageName = _XrmOrganizationService.Retrieve(SPRSet.First().LanguageLocaleId.LogicalName, SPRSet.First().LanguageLocaleId.Id, new ColumnSet("name")).ToEntity<Xrm.LanguageLocale>().Name